RV5C387A datasheet(42/42 Pages) RICOH

Part #	RV5C387A

Description	I2C-bus Real-Time Clock ICs with Voltage Monitoring Function?

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Manufacturer	RICOH [RICOH electronics devices division]

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RV5C387A

PRELIMINARY

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14.8.4.

Interrupt Process

(1) Periodic Interrupt

*2)

Other Interrupt

Processes

Set Periodic Interrupt

Cycle Selection Bits

CTFG=1?

Conduct

Periodic Interrupt

Yes

No

Control Register 2

←

(X1X1X011)

Generate Interrupt to CPU

*1)

(2) Alarm Interrupt

*3)

Other Interrupt

Processes

Set Alarm Min., Hr., and

Fay-of-week Registers

WAFG or DAFG=1?

Conduct Alarm Interrupt

Yes

No

Control Register 2

←

(X1X1X101)

Generate Interrupt to CPU

*1)

WALE or DALE

←1

WALE or DALE

←0

*2)

*1) This step is intended to once disable the alarm

interrupt circuit by setting the WALE or DALE bits to 0

in anticipation of the coincidental occurrence of a

match between current time and preset alarm time in

the process of setting the alarm interrupt function.

*2) This step is intended to enable the alarm interrupt

function after completion of all alarm interrupt

settings.

*3) This step is intended to once cancel the alarm

interrupt function by writing the settings of "X,1,X,

1,X,1,0,1" and "X,1,X,1,X,1,1,0" to the Alarm_W

Registers and the Alarm_D Registers, respectively.

*1) This step is intended to select the level mode as a

waveform mode for the periodic interrupt function.

*2) This step is intended to set the CTFG bit to 0 in the

Control Register 2 to cancel an interrupt to the

CPU.

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RV5C387A Datasheet(PDF) 42 Page - RICOH electronics devices division

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